Bring up of the enhanced bookmarks cluster service.

chrome/browser/enhanced_bookmarks/enhanced_bookmark_model_factory.h

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_ENHANCED_BOOKMARKS_ENHANCED_BOOKMARK_MODEL_FACTORY_H_
+#define CHROME_BROWSER_ENHANCED_BOOKMARKS_ENHANCED_BOOKMARK_MODEL_FACTORY_H_
+
+#include "base/macros.h"
+#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
+
+template <typename T>
+struct DefaultSingletonTraits;
+
+namespace enhanced_bookmarks {
+
+class EnhancedBookmarkModel;
+
+// A factory to create one unique EnhancedBookmarkModel.
+class EnhancedBookmarkModelFactory : public BrowserContextKeyedServiceFactory {
+ public:
+  static EnhancedBookmarkModelFactory* GetInstance();
+  static EnhancedBookmarkModel* GetForBrowserContext(
+      content::BrowserContext* context);
+
+ private:
+  friend struct DefaultSingletonTraits<EnhancedBookmarkModelFactory>;
+
+  EnhancedBookmarkModelFactory();
+  virtual ~EnhancedBookmarkModelFactory() {}
+
+  virtual KeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* context) const override;
+
+  virtual content::BrowserContext* GetBrowserContextToUse(
+      content::BrowserContext* context) const override;
+
+  DISALLOW_COPY_AND_ASSIGN(EnhancedBookmarkModelFactory);
+};
+
+}  // namespace enhanced_bookmarks
+
+#endif  // CHROME_BROWSER_ENHANCED_BOOKMARKS_ENHANCED_BOOKMARK_MODEL_FACTORY_H_